If you like antique engines, vintage tractors or old iron, please register and join us. When you register and log in, lots more features open up to your computer screen. Give us a try and register. See our Welcome Page!

Yeah i realize its a shot in the dark but I got to try. Im trying to figure out how to adapt the current carb to tri fuel. I figure that would be an easier route. Just need to make a vacuum port for the regulator (easy part)and figure out where to place the venturi for the propane (difficult). I know they make kits for couple hundred $ but that takes all the fun out of it. Im also looking at other tri fuel carbs and maybe fabricate an adaptor for that.

Yeah i realize its a shot in the dark but I got to try. Im trying to figure out how to adapt the current carb to tri fuel. I figure that would be an easier route. Just need to make a vacuum port for the regulator (easy part)and figure out where to place the venturi for the propane (difficult). I know they make kits for couple hundred $ but that takes all the fun out of it. Im also looking at other tri fuel carbs and maybe fabricate an adaptor for that.

If your needing the fan scroll cover. Make one, it's really not that hard to do. I made one complete in about 6 hours. Using just a mig welder jig saw and handy grinder along that a drill for the bolt holes. Just measure out the hole locations and draw it out on card board. Use the blower housing for bolt hole locations. I'll see if I still have the templet I made laying around.

What parts should I save from a 4.0 CCK 3CR 12018R
that could be used for a 6.5 NH 3CR 16004P as spare parts??
Any usable parts in the gen head, as I think I will need to go into that soon
The rest could be made available for anyone needing used parts.

Parts interchange manual? I am not aware of one. I believe some folks have successfully modified a gasoline carburetor to accept gaseous fuel. Not sure if the author of this thread is aware of the fact that the older Onan J line gasoline-only equipped carburetor engines utilized different part numbers for many functionally equivalent internal parts. Why, you may ask? Because back in the 60's gasoline contained lead where as natural gas or propane obviously did not.